City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#385
Rowland Heights
County, CA
92 A
#386 Santa Cruz
County, CA
92 A
#387 Sunnyvale
County, CA
92 A
#388 Arbuckle
County, CA
91 A
#389 Camp Pendleton
County, CA
91 A
#390 Cloverdale
County, CA
91 A
#391 Fillmore
County, CA
91 A
#392 Forestville
County, CA
91 A
#393 Orland
County, CA
91 A
#394 Sacramento
County, CA
91 A
#395 Selma
County, CA
91 A
#396 Simi Valley
County, CA
91 A
#397 Sonora
County, CA
91 A
#398 Twentynine Palms
County, CA
91 A
#399 Angelus Oaks
County, CA
90 A
#400 Beale Afb
County, CA
90 A
#401 Big Pine
County, CA
90 A
#402 Brawley
County, CA
90 A
#403 Brentwood
County, CA
90 A
#404 Bridgeport
County, CA
90 A
#405 Cambria
County, CA
90 A
#406 Carnelian Bay
County, CA
90 A
#407 Clearlake Oak
County, CA
90 A
#408 Daly City
County, CA
90 A
Frequently Asked Questions
How are city water quality rankings calculated in California?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in California?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.